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That's what I thought but the scaffold script generate lists in the controller ?!

Try not to take everything single thing in scaffold code as best practice - its just something quick and easy to get you up and running. You'll find the more experienced you get with Rails the less you use it (I don't really use it at all).

That's what I thought but the scaffold script generate lists in the controller ?!

Yes the list is accessed in your controller, but not generated in a method there. If you're going to create a custom set of data you should pull it from the relevant model, then access it in the controller like I showed above.